Icon for a display screen



FIG. 1 is a front view of a computer display screen with an icon in accordance with a first emdodiment of the present invention;

FIG. 2 is a front view of a computer display screen with an icon in accordance with a second embodiment of the present invention; and,

FIG. 3 is a front view of a computer display screen with an icon in accordance with a third embodiment of the present invention.

The computer display screen in all figure views is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an icon for a display screen, as shown and described. 